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Cool Season Weed ID Thread - What is it and how do I kill it?

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513K views 1.8K replies 499 participants last post by  HudsLawn  
#1 ·
These websites has a good list of weeds, sledges, grassy weeds with pictures that help ID them.
Weeds in Turf
Virginia Tech Weed ID Tool

Purdue website has these:(https://turf.purdue.edu/homeowner-resources/)

Control of Broadleaf Weeds in Homelawns (AY-9-W)
Control of Crabgrass in Homelawns (AY-10-W)
Identification and Control of Perennial Grassy Weeds (AY-11-W)
Yellow Nutsedge Control (AY-19-W)
ID and Control of Annual Bluegrass and Rough Bluegrass in Lawns (AY-41-W)

More weed list from Purdue- https://turf.purdue.edu/category/weed-of-the-month/

Some hard to ID ones:
Orchardgrass - http://purdueturftips.blogspot.com/2015/06/weed-of-month-for-may-2015-is.html
Quackgrass - http://purdueturftips.blogspot.com/2015/06/weed-of-month-for-june-2015-is.html

Check the Cool Season guide for Weed treatment options. In cool season, start with a 3-way (eg. Weed b Gon), then move to triclopyr (Weed b Gon CCO), lastly the rest most likely needs round up. A few hardones can be controlled with tenacity (bentgrass, nimble,).
 
#1,821 ·
Overseeded in late February. Raked lawn beforehand, overseeded with Jonathan Green's Black Beauty Golden State (TTTF mix), and then spread Scott's Turf Builder Triple Action Built For Seeding 2 days after that. Watered 3x/day for 10 min until I started seeing some decent growth. Have cut the grass a few times now and would like to start addressing these weeds.

What kind of weeds are these and what type of herbicide (or other product) should I use?

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#1,823 ·
Taking a moment on this Memorial Day to reach out to what looks like some knowledgeable members of this forum.

I have a cool weather shade loving vey thin dark green hairy type grass invading my St. Augustine, I live in Southern California. Very winter this grass seems to take more space in shady areas under our trees. By late spring it starts to seed. Its dense growth, hard to pull out of soil. The areas that get hit by sun come summer die out but if in full shade it survives it. I'll try and post some pictures here. Any help would be greatly appreciated!

Blessing today to those whom served and did not return home.

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#1,825 ·
Path/slender rush has a thin circular stem and makes a small brown seedhead. You can pull up. It typically grows in shaded compacted areas. I know I get some where I keep my golf cart.

Weed Free Zone gets it. That is a 3 way with Carfentrazone.

Here are pictures of mine for id. Your pics are kind of blurry.

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#1,828 ·
Help?! I have several different types of weeds that came into my lane this year. It is a 4 year old *** sodded yard. Always had a couple spots but it really took off this summer. I think I have poa annua, crabgrass and unsure what the lighter green spots are. I am in Canada and for a small fortune I am able to access Prodiamine, PAR3 , killex, roundup, and tenacity. Will any of these help?
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#1,829 · (Edited)
Hey everyone, so I’ve been looking through the archives here and have had no luck in identifying what it is that’s popping up all over my yard.
A little backstory I'm slowly trying to get my very patchy lawn back to what it once was. This spring I aerated and overseeded (with a bag of what I now realize is not good seed (STB)) but regardless of that I now noticed that I’m having some accelerated growth all across my back lawn but I’m quite sure it isn’t the grass that I’m after. It looks like (from my research) either perennial ryegrass or rough stalk bluegrass or the start of barnyard grass). I could be way off but I’m wondering what everyone’s thoughts on it are.
 

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#1,830 ·
Hey guys, new here - just posted my intro in member introduction section. Looking forward to being part of the community.

Any thoughts on this? From my research, it seems like poa annua, but I can’t seem to find any pictures that match it exactly. I took the picture after a fresh mow so it may be a little more difficulty to identify. Any help is appreciated.

Thanks!
 

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#1,831 ·
From my research, it seems like poa annua, but I can’t seem to find any pictures that match it exactly.
That doesn't look like Poa annua to me. The leaves are too narrow for that. Creeping bentgrass would be more likely. Then the leaf would have to have many longitudinal veins on the upper side and shiny undersides. Poa trivialis would also be a possible candidate. This grass only has a double groove in the middle on the upper side of the leaf and the underside of the leaf is shiny. Yellow-green would be more suitable for Triv.

Both spread via stolons that creep along the ground. Maybe you can rake up stolons around the bunch.
 
#1,832 ·
Very helpful - thanks for the response. Does this help at all? I’ve attached pics showing a section I pulled up. This looks more like a fibrous root system to me. Again, that’s based on what I’ve researched, not experience, so excuse my ignorance if I’m totally off. Also, it was pretty difficult to pull up, I’m reading that poa triv should be pretty easy to pull
Up, not sure about bentgrass. Hoping it’s not poa triv..

I was also leaning towards annual rye, what do you think?
 

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#1,833 · (Edited)
That looks more like bentgrass. Just yesterday I lawned a few tufts of it at the edge of a lawn. Unfortunately I didn't take any pictures. Here is an old picture of a colonial bentgrass (Agrostis capillaris) on a fallow field:

This bentgrass forms underground rhizomes, which can sometimes break off when the plant is dug up. Unfortunately, this also makes it difficult to control. But the color doesn't match. Usually bentgrass is bluish (grayish) green. Yours seems to be more of a yellowish green. Unfortunately, the details in your pictures are blurred due to noise reduction. In the previous post I mistakenly wrote that bentgrass has shiny leaf undersides. They are dull.Here is a detailed picture of the collar region:
 
#1,835 ·
I have 2 different grassy weeds that have significantly different colour than my lawn, grow faster than my grass, seem to like lower areas that would be the wettest spots but also seem pretty drought tolerant, are in direct sun, and grow in many small bunches that make up a patch many feet wide. What are they and what do I do with them?

First, the front lawn has a lot of this one. It's a light but bright green colour, and has wider blades/leaves than my back yard problem. I can't find any growing seeds, but there's a lot of this grassy stuff.
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In the back I have a couple patches of this pale stuff. It goes to seed much lower, has narrower leaves, and a more pale colour.
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#1,836 ·
I have 2 different grassy weeds that have significantly different colour than my lawn, grow faster than my grass, seem to like lower areas that would be the wettest spots but also seem pretty drought tolerant, are in direct sun, and grow in many small bunches that make up a patch many feet wide. What are they and what do I do with them?

First, the front lawn has a lot of this one. It's a light but bright green colour, and has wider blades/leaves than my back yard problem. I can't find any growing seeds, but there's a lot of this grassy stuff.
View attachment 53733
View attachment 53731

In the back I have a couple patches of this pale stuff. It goes to seed much lower, has narrower leaves, and a more pale colour.
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I have the exact weed (your first one) and posted in another thread, no one seems to know sadly!
 
#1,837 ·
I have the exact weed (your first one) and posted in another thread, no one seems to know sadly!
The first grass reminds me of common bentgrass that I find in the lawn here:

But this one forms rhizomes, which I can't see in the pictures. Creeping bentgrass looks similar, but has a longer ligule and forms stolons.
What are they and what do I do with them?
The second grass is similar to wall barley (mouse barley), but it has clearly visible leaf auricles:

In the later stages, however, these often drought and are no longer conspicuous:

I have not yet seen curled awns like those in the picture.
 
#1,838 ·
Hi everyone,

This is Helxine soleiroliiis. It has a number of common names, including baby's tears, angel's tears, peace in the home, bits and pieces, bread and cheese. People grow this plant indoors as houseplant but in my case it found its way to my lawn area and it’s been spreading like hell since, covering everything. Grass has no chance.
How do I kill it without killing everything along with it.

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#1,843 ·
Have you uprooted a plant? The narrow, light green leaves seem to come from a different grass, but perhaps they are just young leaves from TTTF. I am writing this because I observed something similar 3 years ago. However, the leaves were only light green and not very narrow. My guess is that it occurred due to local leaching of N.

If it is a different grass, then details (texture, ligule, leaf auricle, etc.) are needed.
 
#1,845 ·
It seems as if the lower leaves are darker green. The appearance could match TTTF. However, what I can see in the pictures are leaf auricles and parallel grooves on the tops of the leaves. Do they exist? PRG is also similar. There, though, the undersides of the leaves are shiny and clearly keeled.
 
#1,848 · (Edited)
Put about 1.5-2 inches of top soil over an indent in the lawn where a previous homeowner had a pool. I sprayed glyphosate before putting the top soil down but might not have killed everything. Seeded 1.5 weeks ago, I have a weed thats popping up quite a bit in the top soil obviously clearing the seedlings in height that have so far popped up. I think it could be quackgrass or just an annual wheat/rye, any ideas? Central Ohio.

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